Kristou Says

To install OpenCV library in Ubuntu from source, I tried these steps. The code of OpenCV is not the last but the one which is in the Ubuntu repository. If you want to install the last version just download it from the official SVN in sourceforge.
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You can install opencv anywhere but its best you put in the propoer place

1) Sign as root

sudo su

2) Go to

cd /usr/local/src

3) prepare your environment

apt-get install build-essential

4) prepare your environment

apt-get install dpkg-dev

5) Download opencv packages

apt-get source opencv

6) Go to extracted opencv folder

cd opencv-1.0

7) List all dependency package informed in

more /debian/control 

Install all dependency package informed in /debian/control by invoking

apt-get install [package-1] package-2] [packga-3] ... [package-n]

9) Also install other necessary package

apt-get install fakeroot ffmpeg quilt

10) Build package by invoking

dpkg-buildpackage -us -uc -rfakeroot

11) Go to samples folder

cd /samples/c

12) Build samples

make -f  Makefile.debian

13) Plug in your webcam and run the samples

./facedetect

14) See you face detected in monitor

I installed ubuntu intrepid on my thinkpad x200. It is mostly working but the graphics were big enough to annoy me.
I tried many xorg.conf configuration and this on worked perfectly for me to fix the screen resolution to wxga.

Section “Device”
Identifier “Configured Video Device”
Driver “intel”
Option “monitor-HDMI-1″ “HDMI-1″
Option “monitor-HDMI-2″ “HDMI-2″
EndSection

Section “Monitor”
Identifier “Configured Monitor”
EndSection

Section “Monitor”
Identifier “HDMI-1″
Option “Ignore” “True”
EndSection

Section “Monitor”
Identifier “HDMI-2″
Option “Ignore” “True”
EndSection

Section “Screen”
Identifier “Default Screen”
Monitor “Configured Monitor”
Device “Configured Video Device”
DefaultDepth 24
SubSection “Display”
Modes “1280×800″ “1024×768″
Virtual 2432 864
EndSubSection
EndSection

I found in Internet a good web page to install many useful thing for Ubuntu.
I paste it for my own reference and it may help othres.
Here is the page
—————–
Here is the summery

Initial setup

1. Install Ubuntu
2. Update and upgrade package sources
3. Turn on the firewall
4. Install the graphics driver

Multimedia

• Media player with codecs – Totem (with DVD playback!), MPlayer
• CD/DVD burner – Brasero
• Media editors – Audacity (sound editor), GIMP (raster graphics editor), Inkscape (vector graphics editor), Blender (3D editor), Rosegarden (music composition)
• Media conversion/transcoding – SoundConverter, MEncoder
• MIDI player – WildMidi, TiMidity++, FluidSynth

Internet & Networking

• Firewall – Uncomplicated Firewall
• Browser – Firefox with Flash and Java
• Communication – Thunderbird (email), Pidgin (IM), Ekiga (VOIP)
• Set up SSH client:
  1. SSH tunneling
  2. SSH public key authentication
  3. SSH key management
• Set up SSH server:
  1. Install OpenSSH server
  2. Set up a static hostname
• Remote desktop – to Ubuntu via secure VNC, to Windows via RDP
• Remote reboot – from Ubuntu into Windows, from Windows into Ubuntu
• File sharing – SFTP, Samba
• Printer sharing – IPP

Filesystem

• Disk partitioner – GParted
• File system cleanup – FSlint
• Mount and unmount various devices
• Copy /home to another partition
• Switch to an existing /home on another partition
• ISO images
• MD5 checksums
• File compression
• File encryption
• Operating on multiple files

Scientific & Programming

• Plain-text editor – gvim
• Compilers and libraries – essentials
• Version control – Subversion, CVS
• LaTeX – TeX Live
• Graphing & plotting – gnuplot
• Technical diagrams – Dia
• Numerical computation – Octave
• Computer algebra system – Maxima

Misc

• Appearance
• Change a default application
• Change user directories and bookmarks
• Windows compatibility layer – Wine
• Rename your computer
• Fix Xine’s WMV playback
• Fix “There are differences between boot sector and its backup” error
• Restore GRUB
• Restart the Gnome Desktop Manager
• Printer setup – Lexmark Z23

The mode is called MULTI-PLOT.

Gnuplot can plot more than one figure in a frame ( like subplot in matlab ) i.e., try:

set multiplot; # get into multiplot mode
set size 1,0.5;
set origin 0.0,0.5; # The upper plot
plot sin(x);
set origin 0.0,0.0; # The bottom plot
plot cos(x)
unset multiplot # exit multiplot mode

Most of the time, I record with recordMyDesktop which produces .ogg-Videos. So any need to convert it to avi file to share the screen-cast.
First you need memcoder, so install it:
sudo apt-get install memcoder
Next use this commend:
mencoder out.ogg -o out.avi -oac mp3lame -ovc lavc

• out.ogg is the .ogg-file you want to convert
• out.avi is the .avi-file you want to create
• mp3lame is the used audio-codec (here mp3)
• lavc is the used video-codec (here libavcodec)